Pin for electric insulators



(No Model.)

J. M. KLEIN.

PIN FOR ELECTRIC INSULATOR$.

Patented Apr. 29, 1884.

N. PFIERS. FINN-Lithographer, Washiu UNITED TATES PATENT @rrrcn.

JOHN M. KLEIN, or SAN FRANCISCO, CALIFORNIA.

PIN FOR ELECTRIC INSULATORS.

SPECIFICATION forming part of Letters Patent No. 297,699, dated Ap1'i1'29, 188%.

(No model.)

To all whom, it may concern:

Beit known that I, JOHN M. KLEIN, of the city and county of San Francisco, in the State of California, have made and invented a new and useful SupportingPin for Telegraph-Insnlators; and I do hereby declare that the fol lowing is a full, clear, and exact description of my said invention, reference being had to the accompanying drawings.

My invention relates to an improved pin or support for fixing and holding in place the glass insulators upon cross-arms of telegraphpoles, and in other situations where an insulated support or attachment is required for an electric wire.

As hereinafter more fully described, my im provement consists in providing an insulatorpin of metal, having ahead of larger diameter than the body of the pin, on which is a screwthread or portion of a thread of proper size to be inserted into and to engage with the screwsocket in the insulator.

Referring to the accompanying drawings, Figure 1 represents the manner of securing glass insulators in place upon a pole by means of my invention. Fi 2 is a View of the pin or support 'in detail, with the cap or insulator glass in section. Fig. 3 is a view of the pin.

A represents a glass insulator of the kind generally employed 011 telegraph-poles and other situations to afford points of support for electric wires, in which is a socket with a spiral thread or groove for fastening it upon its pin. To provide a strong and permanent supporting-pin, I take a length of metal rod, preferably of wrought-iron, and upon one end I form a head, I), of greater diameter than the body of the rod, and of a size to be received into the socket or opening in the glass A. This head b is provided with a spiral thread or groove, 0, to engage with the thread in the socket of the glass, and this forms the means by which the insulator is secured on the pin. The other end of the pin B has either a screwthread, d, out upon it, so that it can be screwed into the arm or other support 011 the pole or elsewhere; or this end is left plain to be driven into a hole made to receive it in the crossarm or other fixture. \V here this pin will have an upright position, as on the top side of a cross-arm, it can be readily driven into the wood; but in situations where the screw-fastening would be preferable the end of the rod can have the screw (1 cut on it. In such case the body of the pin 13 may have a square or flat portion, as in Fig. 3, to receive a wrench.

To form the head or enlarged portion 1), that receives and holds the glass A, I can proceed in several ways; but the simplest and least expensive method, I have found, is to place the end of the rod B within a snitableimold, and then pour in the molten metal around it, the mold employed for t'his purpose having a groove 0r thread in its interior, so that the head, when formed, shall be similarly grooved or threaded to fit into the socket of the glass A.

A very cheap and ready means of forming the head I) is to use solder or lead, and in such case the glass insulator itself could be used as a mold, the end of thepin Bbeing held in the center of the socket in the glass while the molten metal is being poured in around it. The

soft metal will then form a head around and onthe end of thehard-metal pin, and the glass can be readily renioveckby unscrewing itfrom the end of the pin.

By forming an enlarged head in this manner upon the end of the pin, I can adapt my improved pin to the form and style of insulator now in general use, having a socket to receive the end of the supporting-pin.

The advantages possessed by my improved pin are very great. It requireslonly a small. hole in securing it to a cross-armor otherpart of a pole, so that the part is not weakened at the point of fixture to as great an extent as where wooden pins are used. It is out of contact with the inner sides or edges of the glass at the rim, so that the insulation is more nearly perfect, and it will stand great weight and strain in supporting long lines, or where the distances between supportingpoints are, of necessity,'very long, and where the weight or strain is excessive, it will bend and not break off.

Having thus fully described my invention, what I claim, and desire to secure by Letters Patent, is

1. The Wrought-metal pin B, provided with the body of the pin, of cast metal, substantially a soft metal head, 2), which is grooved or as set forth. threaded to fit into and engage with the socket XVitness, my hand and seal. in an insulator for supporting electric wires,

. W T T i 5 substantially as set forth. J RLEIA' 2. An insulator pin or support for electric Vitnesses: insulators, having a wrought-metal body and EDW'ARI) E. Osnonx, a screw-threaded head of larger diameter than \V. F. CLARK. 

